import 'package:halkyon_base_server/base.dart';
import 'package:serverpod/serverpod.dart';

/// Keeps every code and notice mailed, in place of a mail service.
final class Mailbox implements CodeMailer {
  final codes =
      <({String to, String code, EmailCodePurpose purpose, String language})>[];
  final notices =
      <
        ({
          String to,
          AccountResetKind kind,
          DateTime takesEffectAt,
          String language,
        })
      >[];

  /// The notices that codes wait (ADR 0017).
  final codesWait = <({String to, DateTime until, String language})>[];

  /// The invitations to shared spaces (ADR 0044, D37).
  final invitations =
      <({String to, String inviter, String app, Uri link, String language})>[];

  /// Whether it takes no mail, as a mail service down.
  bool refusing = false;

  @override
  Future<void> send(
    Session session, {
    required String to,
    required String code,
    required EmailCodePurpose purpose,
    required String language,
  }) async {
    if (refusing) {
      throw Exception('Connection refused');
    }
    codes.add((to: to, code: code, purpose: purpose, language: language));
  }

  @override
  Future<void> sendResetNotice(
    Session session, {
    required String to,
    required AccountResetKind kind,
    required DateTime takesEffectAt,
    required String language,
  }) async {
    if (refusing) {
      throw Exception('Connection refused');
    }
    notices.add((
      to: to,
      kind: kind,
      takesEffectAt: takesEffectAt,
      language: language,
    ));
  }

  @override
  Future<void> sendCodesWaitNotice(
    Session session, {
    required String to,
    required DateTime until,
    required String language,
  }) async {
    if (refusing) {
      throw Exception('Connection refused');
    }
    codesWait.add((to: to, until: until, language: language));
  }

  @override
  Future<void> sendInvitation(
    Session session, {
    required String to,
    required String inviter,
    required String app,
    required Uri link,
    required DateTime lapsesAt,
    required String language,
  }) async {
    if (refusing) {
      throw Exception('Connection refused');
    }
    invitations.add((
      to: to,
      inviter: inviter,
      app: app,
      link: link,
      language: language,
    ));
  }

  /// The last code mailed to [address].
  String codeFor(String address) =>
      codes.lastWhere((mail) => mail.to == address).code;
}